Gun



June 2, 1931. I MQ 1,808,052

GUN

Filed Jan. 31, 1951 III [In V, V. INVENITOR. I ma a M.M Eann 4&4 r BY k M14 ATTORNEY Patented June 2, 1931 GEORGE M. MISC-ANN, OF NEW CASTLE, DELAWARE GUN Application filed January 31, 1931. Serial No. 512,615.

(GRANTED UNDER THE ACT OF MARCH 3, 1883, AS AMENDED APRIL 30, 1928; 370 O. G. 757) The invention described herein may be manufactured and used by or for the Government for governmental purposes, with out the payment to me of any royalty thereon.

This invention relates to improvements in guns.

In certain types of guns, the powder gases of discharge are conducted from'the bore for utilization in various mechanisms, for example, to check recoil, restore the gun to battery or unlock the breech block.

Where a gun of this character is equipped with a loose liner, that is, one in which a radial play space provided between the liner and tube is taken up in firing and is restorable after firing and one in which the liner is free to expand and contract longitudinally when in action, it has been considered essential to conduct the gases from the muzzle in order to preserve the integrality of the liner and tube.

I have discovered that the gas conduit may be carried by the liner intermediate its length and that provision in the tube to allow for longitudinal movement of the conduit may be made withoutv impairing the action of the liner or interfering with its removability from the tube.

To these and other ends, the invention consists in the construction, arrangement and combination of elements described hereinafter and pointed out in the claim forming a part of this specification.

A practical embodiment of the invention is illustrated in the accompanying drawings, wherein:

Fig. 1 is a sectional view of a gun with a removable liner equipped with agas con- 40 duit;

Fig. 2 is an enlarged sectional view through the conduit;

Fig. 3 is a fragmentary plan view of the conduit.

Referring to Fig. 1 there is shown a gun consisting of a tube 5 and a liner 6. The

liner is freely insertable in the tube, pref erably and usually from the rear, and is held against withdrawal by a ring 7 threaded in the tube.

As shown m0st clearly in Fig. 2 there is a radlal play space 8 between the liner and tube to facilitate insertion and withdrawal of the liner.

In this type acts in firing to with the tube b of gun the powder pressure dilate the liner into contact ut the play space is restored when the powder pressure is no longer present.

In order to conduct the gases of discharge from the bore for application to various liner. The len gth of the slot exceeds the diameter of that portion of the conduit passing therethrough so that the conduit have relative longitudinal movement with may the liner without interfering with the tube.

When the liner is to be withdrawn from the tube, the conduit is first removed.

I claim:

In a gun, an slot, a liner w of longitudina outer tube provided with a ithin the tube and capable l movement with respect thereto, a conduit insertable through the slot in the tube and attached to the liner, the diameter of the conduit being less than the length of the sl 0t in the tube.

GEORGE M. MGCANN. 

